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Vieques Weather in September
Vieques in September averages 30°C (86°F) during the day and 27°C (81°F) at night. This is the wettest month of the year.
Rainfall in Vieques in September
During this month, the rain comes down heavily. A poncho is essential for staying dry. Historically, September sees about 18 days of rain, with a monthly average of 176 mm (6.9 in). This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Vieques in September
In September, Vieques gets high temperatures, with highs of 30°C (86°F). Nights cool to around 27°C (81°F). Overall, the month follows a fairly predictable daily temperature pattern. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Vieques in September
With approximately 236 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.September in Vieques has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Vieques Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Chance of Rain
60%
Precipitation
176 mm (6.9 in)
Rainy days
18 days
Humidity
76% *
Sunshine
236 hours *
Percentage Sunshine
64% *
* Data from: San Juan, Puerto Rico (66 KM, 41 Miles).
Vieques Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Vieques - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Vieques typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Vieques in September
Browse day-by-day weather records for Vieques spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Vieques historical weather extremes in September
Our historical data for Vieques spans 1976 to 2025, revealing these weather extremes.
- Vieques recorded its highest September temperature of 34°C (93°F) on September 24, 2017.
- On September 26, 1997, Vieques saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The coldest night in September in Vieques was on September 28, 1981, with a minimum of 21°C (70°F).
Best Places in Puerto Rico in September
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Vieques in September
Warm but pleasant conditions in Vieques in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Vieques in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming8/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Vieques 3-Day Forecast
More climate data for Vieques
Temperature Rainfall Sunshine Humidity
See the full Vieques climate overview or explore weather in Puerto Rico.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon
30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) Bucket list
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